Hello, On Tue, Mar 03, 2020 at 03:03:58PM +0100, Michael Stapelberg wrote: > Here’s a /proc/<pid>/stack from when the issue is happening: > > [<0>] balance_dirty_pages_ratelimited+0x2ca/0x3b0 > [<0>] __handle_mm_fault+0xe6e/0x1280 > [<0>] handle_mm_fault+0xbe/0x1d0 > [<0>] __do_page_fault+0x249/0x4f0 > [<0>] page_fault+0x1e/0x30 > > How can I obtain the numbers for the next step? Yes, that's dirty throttling alright. Hopefully, the balance_dirty_pages tracepoint which can be enabled from under /sys/kernel/debug/tracing/events/writeback/balance_dirty_pages/ should tell us why bdp thinks it needs throttling and then we can go from there. Unfortunately, I'm rather preoccupied and afraid I don't have a lot of bandwidth to work on it myself for the coming weeks. Thanks. -- tejun
